Computer Programming MCQs

5739 MCQs  (Page 18 of 574)

Attempt Computer Programming MCQs Quiz
The main reason for generation of harmonics in a transformer could be_______________?
A. Fluctuating load
B. Poor insulation
C. Mechanical vibrations
D. Saturation of core
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Distribution transformers are generally designed for maximum efficiency around________________?
A. 90% load
B. Zero load
C. 25% load
D. 50% load
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Which of the following property is not necessarily desirable in the material for transformer core ?
A. Mechanical strength
B. Low hysteresis loss
C. High thermal conductivity
D. High permeability
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Star/star transformers work satisfactorily when________________?
A. Load is unbalanced only
B. Load is balanced only
C. On balanced as well as unbalanced loads
D. None of the above
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Delta/star transformer works satisfactorily when______________?
A. Load is balanced only
B. Load is unbalanced only
C. On balanced as well as unbalanced loads
D. None of the above
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Buchholz’s relay gives warning and protection against_________________?
A. Electrical fault inside the transformer itself
B. Electrical fault outside the transformer in outgoing feeder
C. For both outside and inside faults
D. None of the above
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The magnetising current of a transformer is usually small because it has___________?
A. Small air gap
B. Large leakage flux
C. Laminated silicon steel core
D. Fewer rotating parts
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Which of the following does not change in an ordinary transformer ?
A. Frequency
B. Voltage
C. Current
D. Any of the above
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The leakage flux in a transformer depends upon______________?
A. Load current
B. Load current and voltage
C. Load current, voltage and frequency
D. Load current, voltage, frequency and power factor
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Which of the following properties is not necessarily desirable for the material for transformer core ?
A. Low hysteresis loss
B. High permeability
C. High thermal conductivity
D. Adequate mechanical strength
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Word of the Day
10 Jul
Spur
a thing that prompts or encourages someone; an incentive.
اکسانے والی بات، آر،مہمیز

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